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CJ18ex7.6B KASE

CJ18ex7.6B KASE

4K UHDgc Portable Lenses

Canon Store: $

CJ18ex7.6B KASE

The portable CJ18ex7.6B KASE is an important 4K UHD telephoto zoom lens that is part of our 2/3-inch UHDgc series. Its compact size and low weight support the high mobility shooting often entailed in documentary and many other genres of television field production.

For those seeking a new lens for contemporary HDTV production - while also anticipating a future shift to 4K production - this lens enhances current HDTV optical imaging performance while potentially future-proofing for the longer term. The 18x zoom ratio supports a focal length range of 7.6 - 137mm. 4K resolution is maintained over this total focal range and across the 16:9 image plane.

New design strategies have extended the optical dynamic range to meet contemporary HDR imaging requirements. The lens also supports the wider color gamut specified in the international standard ITU-R BT.2020. An advanced digital drive unit deploying 16-bit encoders is fully compatible with the zoom, focus and iris controllers used with established broadcast 2/3-inch HDTV cameras. Three 20-pin connectors on the drive unit interface with these controllers (such as ZSC-300D and FPD-400D) while also providing a 16-bit interface to virtual systems. The unit empowers a variety of operational capabilities that are set up using the on-board display.

The portable CJ18ex7.6B KASE 4K UHD lens was developed using our exclusive optical design technology to achieve superb optical performance, with 4K resolving power and high contrast from the center of the screen to the edges. High index optical glass materials, each having unique dispersion characteristics, help minimize chromatic aberrations and geometric distortion. Lens element surface accuracy has been improved significantly over HDTV lenses contributing to the enhanced Modulation Transfer Function (MTF) performance required of 4K imagery. New multi-layer optical coatings combined with new deposition processes produce a deeper black reproduction that is important to HDR imaging.

Reduced GhostingSpecial coatings and an internal lens barrel designed to prevent reflection result in clean black reproduction, less ghosting and flaring, sustaining high-tonality images that support HDR.

Weighing only 3.7 lbs. and measuring 6.3" (W) x 4.1" (H) x 8.1" (L), the portable CJ18ex7.6B KASE 4K UHD lens is similar in size to our 2/3" HD lenses, while delivering 4K performance and offering the mobility demanded in the reporting and documentary fields. The lens features the optimum construction and high durability of a conventional HD lens, while offering the same shooting style as that of existing 2/3" HD lenses.

The center of gravity is close to the mount, lessening strain on the hands and elbows of the camera operator. The ergonomic form factor creates a user-friendly design, including an ergonomic grip design for a comfortable feel during operation, helping to reduce fatigue and make it easy to move the camera about. The lens is sure to satisfy with its high-level combination of excellent specifications, enhanced optical performance and outstanding usability.

This feature allows for compatibility with a broadcast-use legacy focus and zoom demand. It enables the use of the legacy zoom and focus electrical drive system accessories such as the ZSC-300D and FPD-400D.

Improved Startup and MobilityThe drive unit of the CJ18ex7.6B KASE 4K UHD lens can output accurate lens position data from the moment the power is turned on and does not require initialization, contributing to the quick start when shooting. This is possible thanks to the drive unit's 16-bit absolute value encoder. Eliminating initialization of the encoder at power-on simplifies calibration when composing virtual and live-action images, and helps to create more accurate composites.

Aberration Correction and Virtual Functions Enabled without Lens InitializationAberration correction functions increasingly been employed on 2/3" HDTV/UHDTV cameras for broadcast use. The associated data files are immediately transferred to the camera, which implements digital correction for the lens aberrations. The lens also delivers digital positional data for external virtual systems.

Advanced Virtual Operability and Precise Virtual Image ExpressionThe drive unit of the CJ18ex7.6B KASE 4K UHD lens uses three 20-pin connectors. One of these connectors outputs 16 bit high precision lens positional data, allowing for output even while the zoom and focus servo controllers are in use. This high-performance encoder helps simplify calibration when composing virtual and live-action images, thus resulting in more accurate composites.

On-board DisplayVarious digital features can be set, adjusted and operated from the display on the drive unit.

The Canon drive unit integrates a variety of operations, stored digitally, that can be manipulated using the display.

Shuttle ShotBy memorizing any two focal lengths, the Canon drive unit can automatically “shuttle” between two points, moving in either direction. As an example, this function is effective for shots in which an operator wants to start from a wide angle and then zoom in rapidly on to an object.

Frame PresetAn angle of view can be preset in either of two memories and the lens will zoom at the highest speed, or in a preset zoom speed, to the pre-set position with the push of a simple button. As an example, this function can be effective for situations such as interview programs, where it is necessary to switch between bust shot and wide shot.

Speed PresetA specific zoom speed can be preset in memory making it possible to repeat the zoom speed as often as you like with the push of a simple button. Using a preset speed when zooming in and zooming out contributes to help create stable images, particularly with slow zooms.

CJ18ex7.6B KASE Box Contents

White Papers

Augmented Creative Control: Innovations in Focus Demand and Zoom Demand Controllers for 4K UHD Long Zoom Field Lenses
Today, large format lens-camera systems have been adopted in many broadcast television productions and producers, directors, and camera operators have now become both attached to, and skilled in, the cinematic imagery and practices supported by these systems. In particular, the “rack focus” is much used in movie and episodic television dramas. This entails a subtle change in depth of field that reveals some new detail (can be an item or another human subject) in a scene – by careful manual operation of the lens focus control. Operational implementation involves changing the focus of the lens during a continuous shot – and this can be small or large changes of focus. If the focus is shallow, then the technique becomes more noticeable. It does demand precision control over focus accuracy.

Very wide rotation angles – typically 270 degrees or greater (from MOD to Infinity focus extremes) – has long been established in the cine lenses (both primes and zooms) used in the motion picture film world.